Method for electrolytic coloring of aluminim or aluminum alloys
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United States of America Patent
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Feb 28, 1989
Grant Date -
N/A
app pub date -
Mar 23, 1987
filing date -
Apr 1, 1986
priority date (Note) -
Expired
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Abstract
A method for electrolytic coloring of anodized aluminum or aluminum alloys in an electrolyte containing metal salts is disclosed, in which the aluminum or aluminum alloy is preliminarily treated in an electrolyte by applying a voltage of substantially positive voltage wave form and, thereafter, the electrolytic coloring is carried out in the same electrolyte by applying an asymmetrical alternating current voltage that the positive voltage is smaller than the negative voltage.
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